Surface modification of LiNi0.8Co0.1Mn0.1O2 with conducting polypyrrole

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• 作者：Xunhui Xiong (1) (2)
  Dong Ding (2)
  Zhixing Wang (1)
  Bin Huang (1)
  Huajun Guo (1)
  Xinhai Li (1)
  
• 关键词：Lithium ; ion battery ; Lithium nickel cobalt manganese oxide ; Polypyrrole coating ; Electrochemical performance
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2014
• 出版时间：September 2014
• 年：2014
• 卷：18
• 期：9
• 页码：2619-2624
• 全文大小：4,440 KB
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• 作者单位：Xunhui Xiong (1) (2)
  Dong Ding (2)
  Zhixing Wang (1)
  Bin Huang (1)
  Huajun Guo (1)
  Xinhai Li (1)
  
  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, Hunan Province, People鈥檚 Republic of China
  2. Department of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA
  
• ISSN：1433-0768

文摘

A facile method for the surface modification of high-voltage and high-temperature LiNi0.8Co0.1Mn0.1O2 cathode materials is demonstrated. In order to prepare polypyrrole (PPy) coating LiNi0.8Co0.1Mn0.1O2 material, the facile chemical polymerization method uses Fe(III) tosylate as oxidant and ethanol as solvent to avoid the side reaction with solvent. TEM depicts that LiNi0.8Co0.1Mn0.1O2 serves as hard template and the nanoscale PPy layer grows along the surface of LiNi0.8Co0.1Mn0.1O2 during the synthesis process. Because of flocculent and nanofiber coating layer, much improved rate performance, high temperature cycling, as well as high voltage performance are obtained. Cyclic voltammetry (CV) and electrochemical impedance spectroscopic (EIS) results demonstrate that the PPy coating layer effectively alleviates the side reactions between liquid electrolytes and LiNi0.8Co0.1Mn0.1O2 surface that are highly unstable at high temperature and high charge voltage.